US 2005/0013015 A1 — Takayuki Sensui
| 14 ELEMENTS / 10 GROUPS |
| 17.55-52.70 mm DESIGN |
| F/2.89-2.91 DESIGN |
| 83.30°-31.16° FULL FIELD |
| 3 ASPHERICAL SURFACES |
| PRODUCTION MFD 0.36 m |
CONSTRAINED_RECONSTRUCTION: surfaces 6A-10 translate rigidly imageward; D5 increases and D10 decreases by the same solved delta. Close endpoints reproduce the patent Example 5 close block-magnification rows and are fitted to the patent block rows. Because those rows contain a small rear-plane inconsistency, the authored fixed-image-plane model reaches its close conjugate at approximately 0.39897 m; Nikon markets 0.36 m MFD.
| Element | Type | Glass |
|---|---|---|
| L1 | Neg. Meniscus (1× Asph) | M-NBF1 catalog equivalent (patent 744495; production supplier unspecified) |
| L2 | Biconcave Negative | J-PKH1 catalog equivalent (patent 519700; production supplier unspecified) |
| L3 | Positive Meniscus | SF6 class / 805254 |
| L4 | Biconvex Positive (1× Asph) | S-LAL12 (OHARA) |
| L5 | Negative Meniscus | S-TIH53 (OHARA) |
| L6 | Biconvex Positive | 618634 phosphate-crown class |
| L7 | Biconvex Positive (1× Asph) | Unmatched (740493; nd=1.739929, vd=49.25) |
| L8 | Biconvex Positive | S-TIH53 (OHARA) |
| L9 | Biconcave Negative | S-LAH65V (OHARA) |
| L10 | Biconcave Negative | S-LAH65V (OHARA) |
| L11 | Positive Meniscus | J-FKH1 catalog equivalent (patent 498825; production supplier unspecified) |
| L12 | Biconvex Positive | 618634 phosphate-crown class |
| L13 | Biconvex Positive | J-FKH1 catalog equivalent (patent 498825; production supplier unspecified) |
| L14 | Negative Meniscus | S-TIH53 (OHARA) |